Well my solid roller 383 was finally wrapped up and dynoed today on the engine dyno. The combo is an EB ported AFR 220's, Accel pro ram intake, 259 267 108 lsa cam .57x lift, T&D rockers with 12.15-1 compression. The car is set up for fuel injection but the shop does not have the ability to use fuel injection on the combo so I borrowed a 750 carb to put on the combo for the dyno and a standard mechanical advance distributor. We only made one pull to 7200 rpms with a very conservative tune and the combo made 520hp@6500rpms and 480 ft/lbs@5000rpms. The egine builder says that the 750 is way undersized and he has no doubt a 1050cfm dominator would net another 60-70hp as he said the power flattened out at 6500rpms. The engine made 472ft lbs at 4000 rpms so it is a torquey engine. The engine builder said there was no use in him dialing it in (more $$) as I am fuel injecting it anyway but I wanted to have it dynoed and valves adjusted etc so that is the only reason I dynoed it this way. The combo was also dynoed without the crankcase vacuum pump which should also net me another ~10-15hp. All in all I am very happy with the numbers and expect somewhere around 600-620 crank horsepower once the engine has the fuel injection, vacuum pump and proper dyno time/ break in. I am shooting for mid to high 10's NA and low 9's on the bottle.

Matt

 

Another player in the LT1 nitrous record hunt?

Get some weight off that car and it might get there.


Nice numbers, keep us informed.


Break in? You heat cycled it twice, its ready to run!

 

I will have the weight down to ~3500 but my car is still a street car and I weigh 235 so it will be difficult to get it light and still be a "street car". If I can run the numbers you run N/A with the 3.70's and nitrous verter I would be really happy.

The engine is already "broken" in. I was refering to making a little more power once I get a few passes on the combo just due to ring seal, etc from running it.

 

Once you get it dialed in with your fuel injection setup. Where do you think the power will peak? I'm assuming you are going to run an aftermarket efi setup, which one?

 

I think the power will peak at around 6900 to 7000 and I am going to run FAST XFI.

 

I also forgot the mention that this was dynoed with standard 1 3/4" dyno headers and I am using 1 7/8" hedman race headers with the stahl flange so I should be able to pick up a decent amount with the exhaust as well.

 

did you pick this bullet up off dirk? sounds like a familiar build... Great #'s..

 

Yeah, this was Dirk's old motor. I only kept the crank, block, heads, and intake. Everything else was upgraded and changed out. It needed some machine work and cleaning from sitting around and when I pulled it apart to check the parts I found they were under rated for the type of combo I wanted.

 

yup great #'s...... especially with a 750 cfm on there.... what are you using for a topper on that pro ram when you're FI???? Accufab TB? Elbow with a 90mm TB????

be sure to read the elbow vs accufab 4500/4150 tb thread i believe in the drag racing tech section b4 you purchase.... some ppl getting upwards of 50-60 hp from going to a 4150 style TB.....

again nice #'s.... better hurry up cause I intend on having the record soon...

 

Thanks for the info. Right now, I have a 4150 style throttle body that was supplied with the pro ram kit from accel. It is supposed to flow ~1200cfm.

 

Very impressive!!!!! Is it streetable or a race car?

 

Good **** matt. Let me know if you wanna use the dyno to tune it. You know you are always more than welcome.

 

very nice

look forward to seeing more info on this project

 

This is a street car. Going to be driven to and from the track on pump gas. I don't have a truck or trailer to tow it anymore...lol

 

Thanks for the offer. I will def be in touch once it is wrapped up.

 

Sweet Deal Matt. Glad to see that ol hunk of Iron is gonna get some use.Really nice numbers,and yeah it should really pick up when you get everything on it.

Damn shame i never got it in mine.

 

I'm new to Lt1's and saw that you was running quite a bit of compression... and I know the design of the Lt1's let you run more compression, but what would you guys consider safe on 93 octane pump gas?

 

Great numbers man! What intake manifold are you going to use and who's vaccum pump?

 

The cam is designed to bleed of compression with a dynamic compression of 9.3-1. This is about the limit for pump gas. Dynamic compression is all about the cam design in relation to the statis compression.

 

Thanks, I am using the ported accel pro ram that is matched to the heads and a gz motorsports vacuum pump.