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Old 06-13-2009, 06:51 PM   #1
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Default 403 rwhp LS1 with stock exhaust manifolds and mild cam

This was a very cool project. Ray Pesek from Port O'Connor Texas has a gorgeous 1937 Ford Business Coupe that he put a bone stock '99 LS1 in. I tuned it and it made 332rwhp/347rwtq. Ray decided he wanted more power, but he didn't want to spend too much and he had to keep the factory exhaust manifolds.

With help from Geoff from Engine Power Systems, we formulated a budget sleeper approach. We would add bone stock 243 heads (unported and unmilled), add Comp 918 beehive springs, swap the LS1 intake for an LS6 intake and make a custom cam using Engine Power Systems custom EPS lobes. These lobes have been making incredible power with beehive springs. The way this motor revs is a thing of beauty. Cam specs are 218/230 .595"/.600" 115LSA +4 advance. The new power was 403rwhp/392rwtq. A gain of 71rwhp and 45 rwtq.

Keep in mind, we were pulling a 7 KPa vacuum at WOT on the dyno. If we had a better airbox, there's probably 10 more rwhp there. Here are some photos of the car with the front fenders off. The confined space meant that Ray had to run a fairly restrictive airbox assembly as the clearance between the TB and radiator is very tight. Like I said, very cool car and it revs to the moon. We gained over 100 rwhp at 6100 rpm.

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Old 06-13-2009, 06:53 PM   #2
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nice numbers .... i mean really nice numbers!!!!!
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Old 06-13-2009, 07:09 PM   #3
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I like the fact that it looks like you gained a solid 30 foot pounds down at 2200 RPM, and just continued to gain more and more all the way through the RPM range...thats sweet.
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Old 06-13-2009, 07:16 PM   #4
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Damn nice job!!!
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Old 06-13-2009, 07:27 PM   #5
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Very Nice.
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Old 06-14-2009, 10:21 AM   #6
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I bet some LS7 manifolds would work nicely and pick up some power. That might be close to header money though...
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Old 06-14-2009, 10:45 AM   #7
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Cost wasn't a big reason why Ray chose to stick with manifolds, fitment was. Take a look at the photos and you'll see there is very little room. Besides, there probably aren't too many manufacturers producing LS1 headers for '37 Fords.

Custom headers would be about the only way to go. 400rwhp was a goal I had for the project and I'm pleased that we were able to gain so much with $500 heads, a $300 intake manifold, a $390 custom cam and $189 springs. That's a big power gain without a big investment. Street manners are wonderful too.
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Old 06-14-2009, 11:29 AM   #8
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Wow, well done!!!
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Old 06-14-2009, 12:13 PM   #9
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Sweet, I love those mid 30s Ford 2 doors. Nice setup, simple and effective
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Old 06-14-2009, 03:12 PM   #10
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Good Job. That coupe should scoot!

243s are great heads, especially if someone doesn't screw them up trying to make them better.

If Vette cast iron manifolds fit they are even better.

http://www.carcraft.com/techarticles...est/index.html

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Old 06-15-2009, 12:51 PM   #11
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Quote:
Originally Posted by Patrick G View Post
Cost wasn't a big reason why Ray chose to stick with manifolds, fitment was. Take a look at the photos and you'll see there is very little room. Besides, there probably aren't too many manufacturers producing LS1 headers for '37 Fords.

Custom headers would be about the only way to go. 400rwhp was a goal I had for the project and I'm pleased that we were able to gain so much with $500 heads, a $300 intake manifold, a $390 custom cam and $189 springs. That's a big power gain without a big investment. Street manners are wonderful too.
plus the $450 tune right??? haha i had too
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Old 06-15-2009, 01:33 PM   #12
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Damn Patrick, my 2000 frc with a lg pro longtubes and a few other bolt ons with the g5x3 cam only made 400 rwhp 380 rwtq. That baby cam really works well. How do the numbers on your dyno compare to LG's ?? Just trying to guage whether they are generous, on par, or stingy. I just can't believe how much power the 243 headed, baby cam and no headers did. WOW !!!!!!!!!!!!!!!!
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Old 06-15-2009, 02:00 PM   #13
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Nice I was wanting to do a sort of mild cam and this looks like it fits the bill

What's the deal with EPS lobes?
What drivetrain? M6?

Would you change anything on that cam with the addition of longtubes?
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Old 06-15-2009, 02:55 PM   #14
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The design goal of this new lobe design was to have the superior acceleration characteristics of older cam lobe designs that have long been proven to make power, but do it in a more controlled, smoother manner.

This lobe design gives us the best of both worlds: Good acceleration with superior control. What this means is that these lobes are typically capable of turning more RPM and making more horsepower than older designs for a given lift and duration. Along with this, another plus of this design is improved durability as compared to older lobe designs, because of the superior control characteristics.

These lobes were designed to be VERY friendly using beehive springs. It is no longer mandatory to use a double spring that typically is going to cost more and be more difficult to install as compared to a lightweight beehive spring.

Additionally, with the correct lifter preload and the beehive springs, this design makes for a quiet install that doesn't have most of the 'sewing machine' noise associated with most LSX cam installs.

This is just one more test showing that these lobes are living up to their design goals.
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Old 06-15-2009, 03:00 PM   #15
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Quote:
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The design goal of this new lobe design was to have the superior acceleration characteristics of older cam lobe designs that have long been proven to make power, but do it in a more controlled, smoother manner.....................
Thanks for the fast response.

As soon as I get my heads done you'll probably be hearing from me.
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Old 06-15-2009, 03:11 PM   #16
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Nice job Pat G. Man, I wish I had all of this knowledge when I started to mod. I would have saved mucho $$.
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Old 06-15-2009, 03:13 PM   #17
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wow, thats seriously impressive. GREAT work
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Old 06-15-2009, 04:06 PM   #18
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very impressive!
is there a grind number for this cam?
so the scr was around 10.5:1?
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Old 06-15-2009, 04:17 PM   #19
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Quote:
Originally Posted by NemeSS View Post
very impressive!
is there a grind number for this cam?
so the scr was around 10.5:1?
The cam uses custom lobes that are only available from Geoff at Engine Power Systems. Call him at 225-751-8500. He can grind you the exact cam or one similar depending on your needs. I am still amazed how well these lobes work with beehive springs.

SCR was 10.5:1 (just like an LS6).
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Old 06-15-2009, 04:55 PM   #20
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Nice numbers.

It makes me wanting 400rwhp out of a full bolt on car and a TR230 cam silly.

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