,New Blower and TA heads included

[BlownMGB-V8]

Hmm, got a little confused there for a moment with a thread on a different forum, ergo the 4x4 reference, sorry about that. Surprisingly similar build though.

Anyway for your application it seems the lower static CR, higher boost, higher flowing head, high lift and duration cam combination is bound to yield good results on the strip. The TA heads are definitely something you should be looking at as a potential future upgrade since they have great flow potential and in combination with a roller cam (Art has some blanks) and a good set of roller rockers will really wake that engine up. In fact you might want to just consider a new build and swap in the crank when the time comes, provided you can match up the mains. What I'm thinking is that by the time you get to the big heads you'll be at the limits of the fasteners, or more specifically the threads in the deck. The bottom end is beefed up and you can install thread inserts in the deck but that'll only go so far. You might plan ahead for an iron block 300 or even 340 Buick based build. Even the 350 may be an option by then, as aluminum heads may be out in another 5 years, though considering that would require a number of incompatible parts I guess the 300 is still the best bet. Spacers for your intake to fit a 300 block are available, seems like TRS and Wildcat might have them.

The iron block is much stiffer and in the 350 version has seen 700hp levels without supplemental strengthening. (The blocks are nearly identical aside from deck height.) 1000+ with a halo girdle and block fill. So the 300 iron block would be a good starting point and thread pull becomes a non-issue. The weight penalty is 80 lbs. If you can accommodate that the benefits are great. Paired with the above upgrades including your blower your power output could go as high as double your last build without to much difficulty and should hold up well. Check over on the V8Buick forum as that site is frequented by drag racers and the small block Buick is a popular engine. Sean has my halo template and has a book that will be out very soon which outlines the very best of the builds done on that forum over the last dozen years or so.

Purchased bare, the TA heads at $1500 are affordable and have tremendous flow potential. Art will do right by you on the roller cam blank. Roller rockers from TA are expensive but other options exist, probably more over there than here. Not sure about the main size on your billet crank though. The 300 used a 3" main bearing where the 4.6 used a 2.5" size. Are bearing spacers reliable enough for a racing application? Should be if done right but really it's hard to say. That would take some research but I do believe it has been done. I would look into the early small block Chevy drag race engines using the production 400 CID siamesed cylinder wall iron block with the earlier cranks, as they had the same issue. I know quite a few of those were built so there should be a good record of how well they held up. I can't say I ever heard of it being an issue though and I believe the bearing spacers have become a stock item.

Jim

[roverman]

Correction, The 300 crank uses 2.50" mains. 340/350 uses 3" mains. Bryan, Stage I Buick valves by Manley or Ferrea, are possible with new seats,(suggested). This gives you valve dia's of 1.77" and 1.5", without moving valve centerlines.The problem with up-grading 300 heads is, time you do "all" the work, they are only slightly less than TA's. The TA head is muck stronger, has six-bolt potential and sbc pedestal rockers, may be used. At some point, with enough boost, you may need to consider a main girdle.  Cheers, roverman.

[Blown v8]

Rather then start a new thread,I thought I'd update this one,
Here's what I started with

I've been collecting parts for a while,then I got UK Blowers to put this together for me

I've bought the bigger valves,springs,retainers etc for my Buick 300 heads,but a change in direction(tax rebate lol) these turned up from South Australia this morning !

I'm going to put the blower on first,run it for a while,the new heads will be going on over the winter,
The carb at present is a 650cfm QFT,do you think I will need to go bigger with the new heads ?
Out of interest my heads took 5 days to get to me,from Australia,got them from TRS

[roverman]

Good Show ! I think I'm seeing a 6V -71 ? I suggest Cometic gaskets or o-ringing, to handle all that new found power. Properly set-up, that blower should make up to 20 lbs boost.  Make sure your "pop-off" is large enough ! Have Fun, roverman.

[Blown v8]

Yep 6v71,with Dean Blowers heavy duty bearing cases,large pop off valve on other side !
Cometic gaskets included with the heads,may O ring as my old heads

[roverman]

FWIW, TA's will swallow a 2.02"  intake valve, with their standard centerlines. Power to the people ! roverman.

[Blown v8]

I bought mine complete,

[roverman]

Bryan, Valves angles and centerlines are "different" than oem RV8 or Merlin. This is criticle for the valve notches, in your pistons. Now, go kill some Chevies.... roverman.

[Blown v8]

The heads are on !(nearly)
Checked valve to piston clearance on all eight cylinders,no notching needed



Hoping to have it running by the new year on my old headers,but will be making a new set in the new year

[BlownMGB-V8]

Fantastic Bryan! Can't wait to see how those heads work for you,

Jim

[Nexxussian]

Old thread I know, but is there a thread with the results of the combination described, somewhere?

[Blown v8]

The engine has been rebuilt with all new bearings,new pistons,rings,roller cam,heads have been ported,
It's been run in on the dyno,made 472bhp @ 6k with 12lb of boost,
More boost will be added,and the engine will/can Rev a lot higher,cam has more then 6 thou lift '
Once I'm happy with it,I will put full spec up !
Ignition is all in at 16*

[roverman]

Bryan, Good Show ! What octane fuel, or E85 ? 16* total timing, sounds a little short ?  Cheers, Art.

[Blown v8]

A preview of what's coming





Carbed at the moment,fuel rails in with dummy injectors,6:71 running 10% under to give 15lbs of boost

[Blown v8]

Injector hat by JoBlo Australia

Dry fitted

Will have a spacer fitted,inch high,two inches forward,
8 injectors in the hat,8 in the manifold,all new coil pack ignition controlled by by state of the art ecu,
Stay tuned for further developments

[BlownMGB-V8]

Pretty slick. Love the intake.

But 15 psi and no intercooler? So... methane?

Jim

[roverman]

Perhaps I missed it, tell us you have a forged or billet crank ?  art.

[Blown v8]

Billet crank,Chevy steel rods,forged pistons,roller cam,ARP everywhere,JE eales front cover,ceramic clutch,

[MGBV8]

Wow.

[gsjohnny]

bryan,

love those intakes. did you make them?

I read here, don't post here to often because I run a 350 s/c in a front engine dragster maintain a thread on the bpg site.

john

[Blown v8]

My mate made them,he has kept the jigs in case there's any one else wanting a manifold

[gsjohnny]

bryan,
 does he make for the 340 or just the 300? and as always... the price?
thanks
john

[Blown v8]

Only got the jigs for Rover/300 /TA  price would depend on if you just wanted a blower manifold or injected as well