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#1
08-15-2023, 01:56 PM
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Thoughts on this 455 build?
- 1971 GTO 455 YC
- 9.5:1 compression - .030 over, forged pistons, reconditioned rods, new bearings, new expansion plugs, ARP hardware - 1971 400 #96 Heads - Comp 995 springs, stainless valves, viton oil seals, hardened valve locks, screw in studs and guide plates - Spotts Performance Ram Air IV 041 Cam and Lifters - Spotts Performance Stainless 1.6 7/16 roller rockers w/ poly locks - Spotts Performance 7/16 screw in rocker arm studs |
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#2
08-15-2023, 02:03 PM
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Strong street motor. Heads ported? Intake?
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#3
08-15-2023, 02:08 PM
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That is a very popular combo from the pre aluminum head days. Get better rods and a modern cam profile. There is no reason to use stock rods anymore. You can get better ones for what it costs to redo old rods with machining and bolts. You are going to get lots of opinions... good luck!
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#4
08-15-2023, 02:40 PM
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I don’t like the CC 995 springs due to the flat wire damper in them.
I prefer Crower 68407 springs which are a duel coil spring like the factory ones. Crower 87408 retainers should be used with them. By the time you get done rebuilding the factory rods you will really not have gained much strength and spent just about the same amount of bucks as investing in new stronger rods. Also since due to the new forged pistons you will need to rebalance the motor, then the far lighter aftermarket rods will allow the motor to rev up a good amount faster. You should take advantage of that and the fact that the bearing and block loads will be less.
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! Last edited by steve25; 08-15-2023 at 02:47 PM. |
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#5
08-15-2023, 07:50 PM
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My buddy Goodman suggests the rods be replaced with new forgings.
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#6
09-05-2023, 12:51 AM
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I am using those springs with the Crower 60919 cam and it seems to be pretty good
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468/TKO600 Ford thru bolt equipped 64 Tempest Custom. Custom Nocturne Blue with black interior. |
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#7
09-05-2023, 06:02 AM
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Geez, a opinion from you and not a question!
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
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#8
09-05-2023, 11:09 AM
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Great street combination, should run real well with a good efficient 2800-3000 stall converter and 3.23-3.42 gears
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1978 Trans Am Pump Gas 461 Stroker |
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#9
09-05-2023, 11:45 AM
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Quote:
My suggestion would be a Performer RPM manifold to top it off if hood clearance is not an issue. Enjoy! 
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Eric "Todd" Mitten '74 Bonneville 4dr Sedan (455/TH400/2.93 open) '72 LeMans GT (455/M-13/3.23 [8.5"] posi) '71 GTO Hardtop (400/TH400/3.07 12 bolt posi) ‘71 GTO Convertible (455HO/TH400/3.23 posi) '67 GTO Coupe (455/ST-10/2.93 posi) '67 Tempest Wagon (428/TH400/2.56 posi) Deuteronomy 8:3 
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#10
09-05-2023, 01:18 PM
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Quote:
__________________
468/TKO600 Ford thru bolt equipped 64 Tempest Custom. Custom Nocturne Blue with black interior. |
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#11
09-05-2023, 02:47 PM
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Try these rods, stronger than stock and plenty strong for your build.
https://butlerperformance.com/i-3164...tegory:1459645
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Tim Corcoran |
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#12
01-17-2024, 07:50 PM
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Quote:
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#13
01-17-2024, 10:45 PM
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Quote:
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