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Today was Dyno day 427 SBC pump gas street motor
Dart block with a “400” bore size with 350 main journal for a total of 427 cubic inches
Scat forged 4 inch stroke , stroker kit with Diamond 12 cc dish pistons should be just under 11.0 to 1 compression
Custom Hydraulic roller camshaft 244/254 at .050 ,.639 .639 lift , 114.5 LSA on a 108 ICL , lobes we’re hand picked from Comp’s lobe library and considered a manual brake camshaft , Morell full travel lifters adjusted to .050 pre load , Scorpion 1.6 ratio rocker
Brodix 18X cylinder head and top end package with a very shallow 68cc chamber, 2.14/1.6 valve package, Bee hive springs , 258cc intake port (small port for 18 degree heads) heads were out of the box no port work but intake was matched to the cylinder heads, this 18X kit is very a complete kit for 3600.00 which includes all the gaskets, head studs , Victor style intake , valve covers ,including cylinder heads, basically everything above the block !
93 pump gas
peak horsepower 682 at 6400 rpm
peak torque was 647 ft lbs at 4800 rpm
torque at 3800 rpm was 568 ft lbs
horsepower at 6800 rpm was 638
idles a decent 800 rpm
tested on 93 octane and using Performance Clinic Dyno 750 HP Holley, we will be using a 950 HP in the vehicle
Good results! What are the plans for the engine? Is it going in a drag car?
it’s going to be for street , it idles 800 rpm , does have a Turbo350 transmission with 3800 stall now and will be mated to a 3.30 gear , may go overdrive eventually but this is a small hydraulic roller cam it’ll be happy with about anything
It's all about the heads! Once you get to driving it I think that you find that traction with auto trannies is very problematic. I also originally used a 3800 stall 9.5 inch behind my 427 sbc. I also can't imagine a th350 lasting very long.
It's all about the heads! Once you get to driving it I think that you find that traction with auto trannies is very problematic. I also originally used a 3800 stall 9.5 inch behind my 427 sbc. I also can't imagine a th350 lasting very long.
Are you using offset lifters or rockers?
He might have to mini tub it for traction , the Turbo 350 is full manual valve body and beefed up by me so it should hold this power, his old combo was a 7500 rpm 525 horse power 355 , this will be like a tractor engine compared to that . We knew Skip White's 427 was with a bigger hydraulic roller but had smaller 200cc intake 23 degree heads and makes 640 hp , our cam is much smaller but the heads are way better so we was thinking 640 ish so this was a pleasant surprise , sometimes you hit a good combination first try
The 18X series with the 252cc intake port uses the traditional 23 degree valve train components , no off set rocker or lifters , in this case they are just 23 degree1.6 Scorpion traditional roller rocker with stud girdle and Morel roller lifters with standard plunger travel 18 X™ Series/18° - Brodix
From: At my Bar drinking and wrenching in Lafayette Colorado
Hey, Eric...
Is your next post going to be, "Does anyone know if my engine combo will fit under my stock '80 L82 Vette hood?"
Sweet engine build - solid simple approach that always works. Love it!
Lars
He might have to mini tub it for traction , the Turbo 350 is full manual valve body and beefed up by me so it should hold this power, his old combo was a 7500 rpm 525 horse power 355 , this will be like a tractor engine compared to that . We knew Skip White's 427 was with a bigger hydraulic roller but had smaller 200cc intake 23 degree heads and makes 640 hp , our cam is much smaller but the heads are way better so we was thinking 640 ish so this was a pleasant surprise , sometimes you hit a good combination first try
The 18X series with the 252cc intake port uses the traditional 23 degree valve train components , no off set rocker or lifters , in this case they are just 23 degree1.6 Scorpion traditional roller rocker with stud girdle and Morel roller lifters with standard plunger travel 18 X™ Series/18° - Brodix
Which motor are you talking about at Skips their 434 or 427 5.5 cause there cam is smaller heads are smaller and intake is a little shorter , so your cam I don't think is a lot more smaller just more lift either way that 427 you built will be awesome.
I’m using the same galvanized wash tub on my 496 build and it will fit under my stock 73 hood!
At least that’s what I read on the internet, so it must be true!
I was wondering about the cam specs. Really wide specs between intake and exhaust. Hydraulic roller camshaft 244/254 at .050 114.5 LSA. That 10 degrees is for low flowing heads and a restrictive exhaust. You kinda see numbers like those with the 114.5 on motors like the LS7 with great big intake valves and flow numbers, but a very quiet restrictive exhaust.
I was wondering about the cam specs. Really wide specs between intake and exhaust. Hydraulic roller camshaft 244/254 at .050 114.5 LSA. That 10 degrees is for low flowing heads and a restrictive exhaust. You kinda see numbers like those with the 114.5 on motors like the LS7 with great big intake valves and flow numbers, but a very quiet restrictive exhaust.
Cam lobes were picked based on the flow chart and a vehicle didn’t have power brakes and street use , Lift is hand written for 1.6 and 1.7 ratio ,we used 1.6’s for the .637 lift , valves are 2.14 and 1.6 , the split duration is for the full exhaust system, we’re pretty happy at this point as it’s exceeded expectations , usually the dyno breaks hearts and shatters dreams . Lol
this is a very tall top end kit and would require it least a 4 inch L88 hood , this particular engine is going in an employee’s 1970 Nova . Flow is about as good as you can get short of going offset lifters and rockers
Dyno day 427 SBC
Once you get to driving it I think that you find that traction with auto trannies is very problematic. I also originally used a 3800 stall 9.5 inch behind my 427 sbc. I also can't imagine a th350 lasting very long.
