I use the ARP bolts for a 350 Chevy for my TR6. I believe they are the same
as Spits.
I did break the heads off of 3 out of 4 one time but have had no problems
since then.
Charly Mitchel
TR6 #44
----- Original Message -----
From: "Robert MacKenzie" <list@mackenzie.aero>
To: <fot@autox.team.net>
Sent: Tuesday, May 25, 2010 8:06 PM
Subject: SPAM-LOW: [Fot] Spitfire Flywheel Bolts
>I have been building up a performance 1500 engine for my '79 Spitfire
> street/autocross car.
> Starting with a early 1500 block with flat-top pistons, I had all the
> spinning bits dynamically balanced and installed one of Ted's 275-4 cams.
> 9:1 CR topped off with a ported head with custom bee-hive valve springs
> by
> Costa Mesa R&D. All in all a solid but not over the top spec looking more
> towards reliability and drivability over outright performance.
> One choice I made was to stick with a stock flywheel. When I installed it
> I
> used new bolts from a reputable specialist vendor. I have heard that one
> should not re-use the original bolts and I have also read the ARP bolts
> are
> higher in shear strength but tend to be brittle and break.
> The engine ran fine on first start but after a 45 min run-in the first
> time
> I opened the throttle and brought it up to some serious RPM (5500 +) the
> flywheel bolts failed.
>
> Questions:
> What is everybody else using in their full race motors?
> Could this just be a bad bolt or two?
> What are your thoughts on APR vs stock hardware?
>
> Robert MacKenzie
> NASS # 511
> Austin Texas
> '79 1500 (street)
> '62 Spitfire 4 (race)
> _______________________________________________
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>
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