Not Turbo, very old school, but still trick engine builds for sports cars.

R3Fab

New Member
Joined
Dec 17, 2021
I was a member here years ago but "Life" got in the way of my builds.
Now "Retired" and getting back into putting some toys together.

Nothing Turbo but I have two V6's to build.
A 231 with raised compression, hot cam, TA aluminum flywheel, and undecided 4V intake, headers.
It will be going into a replica 60's Sports Racer. Look up Dio Tipo for lots of pics.

The second started out as a mundane 225 odd-fire build but has gotten out of control and is now a Moldex 3.6 billet crank, Carrillo rods, JE Forged piston, extremely rare Inglese' manifold with twin Weber IDA-3C's, TA light steel flywheel, etc. monster engine project.
It will power a heavily modified Triumph GT6+

Not a wealthy guy so these are proceeding slowly but it there is interest I will post progress and pics.
If anyone else is doing any NA builds I may have some extra parts collected years ago.
Located in the wild lands of No. Nevada.
 

WarWagon

Caustic Cacophony
Joined
Mar 10, 2007
I have a 10:1 compression 4.1L going together later in 2022 built for boost but could also be a nitrous NA engine. I have a built 9.5:1 compression early 3.8 block .030 overbore in an '84 Isuzu Impulse that has a vibration issue that I'll bearing into shortly. Might build a spare short block with parts of my leftovers.
 

R3Fab

New Member
Joined
Dec 17, 2021
So who is the Guru for this sort of build?
Any chance I can use my original 225 block?
Not going for absolute max HP, anything over 225 will be fine.
I would have used a stock crank if I could have found one quickly.
My impatience on this is going to be expensive. :eek:
More interested in the "Unique sound" of an odd-fire and they make the same HP.
 

~JM~

Wrinkled Member
Joined
Oct 31, 2007
My first Buick was the Dauntless 225. It had one of the Offy dual-port 4Bbl intakes, 390CFM Holley, headers & unknown camshaft. Moved my CJ5 with ease. Wish I still had it.

Looking forward to following your project.
 

R3Fab

New Member
Joined
Dec 17, 2021
Crank and rods arrived at the machine shop.
Finding info for this build difficult to come by.
I "Think" the crank will fit into an even-fire block?
I have heard that the even fire block has a taller deck which might have an advantage for the 3.6" stoke and piston selection.
It would also allow me to use the EF "Tall Port" heads without oiling/cooling issues.
If anyone can confirm it would help a lot.
My Buick "Free Spirit" book is not being particularly helpful as it seems to pretty much ignore odd-fire engines.
 

R3Fab

New Member
Joined
Dec 17, 2021
I would like to confirm that the 3.8 has a taller deck height of 10.187" instead of the 225's 8.96"?
 

R3Fab

New Member
Joined
Dec 17, 2021
I thought that deck height difference seemed extreme.
Correct is 9.56", the chart I looked at earlier is wrong.
Still .600 taller than the 225.
If my math is right this means I only have to shift the pin boss up .140" for the 6.5 rods if using the 3.8 block.
Custom pistons so should not be a problem.
At .020" over that nets me 247.55 CI.

Now looks like I will have a 225 OF block and new pistons as surplus due to "Mission creep".
Anyone need to freshen up their old Jeep?
 

R3Fab

New Member
Joined
Dec 17, 2021
Spoke with JE Pistons.
Compression height comes in at 1.260"
Trying to end up at 9.5-1, no more than 10-1 compression.
I think that means dished but not sure until I verify head volume.
$138.00 Each plus pins, locks, and rings.
Hoping to keep it down to a 3.820 bore.
If anyone knows of a "Deal" on pistons to that spec I would love to hear about ir.
 

R3Fab

New Member
Joined
Dec 17, 2021
The John Thawley book claims 8.5-1 max compression for a street engine?
Seems low, I was hoping for 9.5-1.
Old school engine so running an HEI odd-fire distributor.
No computer timing control or knock sensors.

Do I really have to run such low compression?
Car will be about 2000 Lb. and five speed.
 

~JM~

Wrinkled Member
Joined
Oct 31, 2007
I run 9.5-1 on an open chamber iron head Cadillac 500 with KB hyper flat-top pistons zero decked with .045" squish on 91 octane premium. Lightweight vehicle & TH400 trans. No audible detonation yet. No evidence on plugs. Coolant temp +/- 180 degrees.

Not really a direct comparison, but all that I have to offer.
 

R3Fab

New Member
Joined
Dec 17, 2021
My newest "Shiny object", when did Buick go to aluminum heads, and may they be had with the conventional intake port shape?

Bad news is that I have already bored and decked the old 225 block, also have new cast pistons.
But I cannot seem to get a consensus on whether or not the tall port heads will work on it.
 

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