340 cam in a 318

abodyjoe

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I put a .474/280 MP cam in a stock 318. That is for sure larger than a 340 cam. I put a TQ on top. It was faster. I won races. Even with my stock TC and 2.76 gears.

thats the hemi grind isn't it? i had that cam in a 69-70 stock 318 many years ago,, i forget if i had the J heads on that motor or not. had 3.23 gears in it, small eddy carb and headers.. car ran damn well... idled and drove stockish.
 

318willrun

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thats the hemi grind isn't it? i had that cam in a 69-70 stock 318 many years ago,, i forget if i had the J heads on that motor or not. had 3.23 gears in it, small eddy carb and headers.. car ran damn well... idled and drove stockish.
Was it the .474 or .484/284 that they called the hemi grind.... my mind draws a blank
 

Ironracer

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thats the hemi grind isn't it? i had that cam in a 69-70 stock 318 many years ago,, i forget if i had the J heads on that motor or not. had 3.23 gears in it, small eddy carb and headers.. car ran damn well... idled and drove stockish.
I ran the MP .474 "street Hemi" grind in a 68 Coronet 383 Magnum 4 spd. Tall Wieand single plane, headers, Mp elec ign, windage tray, fully grooved Mains and a high volume oil pump, headers into Flowmaster. That hardtop was a bad *** ride in the 90s I never should have got rid of that mother I kind of got screwed out of it technically
 

abodyjoe

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Was it the .474 or .484/284 that they called the hemi grind.... my mind draws a blank

the 284/484 was larger then the hemi grind

280/474 was the hemi grind small block cam..

cams.JPG
 

Bighead440

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The OG Street Hemi B/RB cam had 284* duration and .471/.474" lift (split pattern) and 108*LSA.
Mopar Performance reeingneered the Direct Connection original to: 280* duration with .474" lift (single pattern) with a 110*LSA in the late '80s if I remember correctly. Comp Cams' Magnum and Isky Mega had upped the ante with their more modern profiles, so the duration advertised went DOWN to 280 from 284 and the .050" duration went UP from 228 to 230, and they widened the lobe separation to 110 from 108 to clean uo the idle some and broaden the powerband some. In big blocks, the late grind impressed me with it's performance but the magic "sound" was gone. Never tried the original SB Street Hemi, but it was ground on a 112, so it's LSA moved the other way, and the intake lobe was common with the exhaust. A friend used one in a low compression (reman late 70s shortblock) 360 with J-heads and Crane 1.6 roller rockers with nitrous in a '72 Duster. Ran better than it should, until they cooked the bearings and it lost oil pressure. Either way, I prefer the smaller (two steps) 260/268*-.430/.450" Purple Shaft in a 318 for performance and a 360 for towing.
 
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