354 hemi, EMC update

Discussion of the 331-354-392 HEMIs.

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dan miller
Posts: 86
Joined: Wed Dec 27, 2006 5:05 am

354 hemi, EMC update

Post by dan miller »

This year, we're running a 354 hemi (4.009" X 3.612" -.013" destroke - 365 cid). We had planned on being on the pump by now, but (again) have been held up by cylinder heads.

The short block is complete, save for pistons, which shipped from Ross on Friday. It took digitizing the heads and three tries to get them just right. Pat O'Neil at Ross is the BOMB. He is knowledgeable beyond belief and a joy to work with on odd ball stuff. We're using an Engle Cam (246 @ .050"), Rocker Arm Specialists 1.9:1/1.54:1 rockers, Hot Heads belt drive, Melling M72 (low volume 318 Mopar) oil pump, and a Steff's pan.

Heads (Hot Heads) are done, however several of the push rod tubes leaked, so back to Bob McKray performance for the fix. They're done, and will ship tomorrow. We ended up at 350 cfm (365+ is available, but we felt that was too much).

Ignition system is a MSD 8, with a MSD Digital Controller, and a MSD small block Mopar distributor (borrowed from Tom Waters last year and not returned - Thanks Tom - I'll return or purchase it this year).

Headers are Hot Heads 1.75" X 31" with merge collectors and a 3" stinger into the EMC mandated 3.50" mufflers. Intake manifold is a Hot Heads dual plane, and carburetor is a hopped up 4777 (930 cfm).

I have pix, but haven't the computer savvy to post them here.

Danny
George
Posts: 694
Joined: Wed Aug 25, 2004 4:12 pm
Location: Fl

Re: 354 hemi, EMC update

Post by George »

The HV pump flows 3.5% greater than OEM, how does standard compare? What's this about push rod tubes leaking?
dan miller
Posts: 86
Joined: Wed Dec 27, 2006 5:05 am

Re: 354 hemi, EMC update

Post by dan miller »

Hello George

Don't know the flow numbers. The M72 is the smallest pump that is easily adaptable, flows plenty for our purposes, and is inexpensive. We replace the guts on a regular basis (maybe every other race) due to the rotor and rotating element getting metal embedded in them. Melling sells a kit, K72, that contains all the guts for under $30.

When porting the intakes, the push rod tube holes are broken into. They are then reamed and thin wall brass tubes are inserted (which protrude about .150" into the port). Believe it or not, the tubes have zero impact on flow. They are a light press fit into the heads and are usually installed with Loctite.

Danny
George
Posts: 694
Joined: Wed Aug 25, 2004 4:12 pm
Location: Fl

Re: 354 hemi, EMC update

Post by George »

Thanks, first I've heard of anyone going to a smaller pump. If it works in a race engine, should work elsewhere, I'd think.
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