looking for a littel more power
 

pulling engines this winter to check/fresh want to see what everyone thinks heres what i have.540x2 short deck.950hp holleys world merlin int. world merlin 320 heads dart blocks callis d/s cranks manley rods je pistons 9.2 comp. hyd roller cams 611int/596ext 234/240@50 gill manifolds dry tails throug trans msd ign. thanks tell me know what yall think

My guess is your engine makes about 550-575 hp the way it's set up right now. Sorry but those heads are not much better than stock GM rect. port heads, the cam is short on duration and lift, and a 950 Holley actually has the same size venturies as a 750. A bunch of OSO members have 650-700 hp 540's running around but the cost is so high , new heads, cam, Dominator carb and manifold, it would be worth while to put a blower on it and make more.

what do you think should be on them carb.intake heads cams anyone else have thoughts

AFR 315 CNC heads, Edelbrock Victor intake, 1050 Dominator carb, custom cam with a bit more duration and lift and maybe 1.8 rockers on the intake side. 10.0 - 1 small dome pistons by JE-SRP. This combination will make 700 hp in a 540 and idle nicely at 800 rpm. Problem is, the heads cost all most as much as an 8-71 blower.

do not have hight and no scoops

what do you think about carbed prochargers

My engines responded well to a set of Merlin "X" intakes and AED worked 1050 Dominators.

ok on heads& intakes what about cams

I think intakes and 1050's..carbs to small

If you go M1 with 5 lbs of boost you will be OK, Any more then that you really need to go EFI. Look into Rtech intercooler with vortex

rtech like 8000.00 per engine already talked to him

A good tune and a good set of header manifolds or headers will probably net you the best bang for the buck on those engines as spec'd.

Best Regards,
Ray@Raylar

ok got afr 315 cnc heads cam going to be 646/629 lift 242/248 @ 50 got stellings dry headers now i have 950 hp carbs merlin intakes prosystems wants to do 1000hps that will flow about 1000 with same intakes or go dominators

That will wake them up. If you still have regular Holley 950HP's they will be your limiting factor. I played around on a flow bench testing some carbs and different spacers. Maybe some "unscientific" data, but my old Holley Barry Grant 750's outflowed new Holley 950HP's all day long. You need Dominators!

looking at doing the same thing your doing. currently running stock GM heads on a 540 w 9.5:1 comp. would i be better off looking for blowers and swapping pistons or upgrading cams/intake/carbs/heads to attain 700hp...........dont mean to hijack

i was thinking dominators but prosystems said there 4150 1000hp would be better all around for pleser boat

I like the Pro-Systems 1000, but if you're looking for a great idle with a bigger cam go to the SV1. I would look at Lightning headers and Harland Sharp 1.8 rockers. Biggest bang for the buck and easy to do.

I have spoken to Patrick @ Pro Systems on a number of occasions regarding the SV 1 in marine applications. Having seen them perform on the automotive side it is amazing just how clean they are throughout the entire pull. He is, however, very cautious about bringing any product to market prior to it being fully sorted. The development and test cycle for the marine side should be completed this late spring, early summer at which time they will be brought to market. We may be doing some of the testing on these and anticipate them to be a major step forward.

Bob

Adam, those square port heads or oval port?

FWIW.... I have a 557 with AFR 315s, mild solid roller and a Dominator. KE for exhaust. 696hp on the dyno. Runs like a banchie yet very well behaved in no wake zones and at the dock. I like the Dominator.

Hello Bob !!

rectangular.....GM 088's

I dont know Adam, mine are 572 W/ alum. Brodix heads,10 to 1 comp. making that power....700HP is a tall order for a N/A engine runnin pump gas. And then theres the reliability factor...I say go blower. Problem is, changing pistons involves alot too. Machine work(more than people think), fit rings, rebalance assembly,ect... Also, you will most likely need a cam change if your adding a blower, then springs and maybe pushrods, depending on your new geometry! Not to mention the blowers, carbs(4), flame arrestors, carb linkage, fuel regulators,ect....So, I dont know. ..........IMO, if price is not an issue, go blowers, easier to make 700 HP and less stress on the engine on at normal running speeds. Wow, now IM stressed out!

your prolly making 700hp at 5200. I am going to spin mine about 5800.

Hey kreed park here just my 2 cents,have 540s,dart pro 1 heads,dart intake,1050 dom,gils msd box,motores dynoed at 625plus at 5400rpm,run 93 all the time no problems would go n/a over blowers any day just my 2 cents,can spin a 26 b1 to 5800 no problem

my 540's are also strokers which i think gives me some more power...park, what comp you running???

I am running9.5-1,carb set alittle fat and no thermostat,water temp NEVER goes above 120. The key to avoid problems is not to much comp,gd fuel and alum heads they remove heat much better

Question is, are your motors still making power at 5800 ?? If they are, your motors make more power than 625. If not, your spinning them above power band for no reason, and will eventually break something, youll need bigger props. Adam wants 700 HP, so he needs 75 MORE HP than you have now. With the same CI, aftermatket heads and the same compression, only one way to get the extra HP....Camshaft.... So IMO, if he goes N/A, he is going to need a more radical cam, which is stress on the valve train all the time. With a blower, he can use a smaller cam which I believe will result in getting longer engine life. Plus, blowers look SICK ! These are in my old boat,and are baby blowers, but I personally like how they look.....

I should say that when I spun them to 5800 it was when I put them in my new cig,they should be at 5400,so u are right I do need more prop just went for a quick test run,I agree blowers look sweet but I guess I am old school,as far as cams go more dur is better than high lift bbc have a funky valve angle,I also have stud gruidles just my opion

No, I understand where your comin from. Im just going on my past experience also. To each his own. Did you ever find a new exhaust system for the Cafe'? I have CMI also and thinking about going to SM Gen3 exhaust after hearing all the horror stories!